Saturday, August 16, 2008

Linux RAID Smackdown: Crush RAID 5 with RAID 10

Carla Schroder has written an excellent article about using RAID 10 on Linux.

RAID 10 is a worthy RAID level with many advantages. RAID 10 is shorthand for RAID1+0, a mirrored striped array. Linux RAID 10 needs a minimum of two disks, and you don't have to use pairs, but can have odd numbers. The basic differences are:

  • RAID10 provides superior data security and can survive multiple disk failures
  • RAID10 is fast
  • RAID10 is considerably faster during recovery— RAID5 performance during a rebuild after replacing a failed disk bogs down as much as 80%, and it can take hours. RAID10 recovery is simple copying.
  • RAID5 is susceptible to perpetuating parity and other errors

The main disadvantage is cost, because 50% of your storage is duplication.

Read more here: Linux RAID Smackdown: Crush RAID 5 with RAID 10 - Linux Software RAID 10: New and Excellent